I'm going to add my 2 cents from both a coach and parent of a young wrestler.
We need to make wrestling FUN at an early age to help young wrestlers fall in love with this great sport. My son actually quit wrestling this season because he was not having fun at practice. The emphasis at the practice was more about "getting better" than about having fun. He is only 6...I could have cared less if he got better or if he won any matches. I wanted him to learn to love the sport first, and then compete second. We will try again next year with the same goals in mind.
There is too much of an emphasis on winning 6U trophies than there is with truly helping young athletes develop a love and passion for the sport.
Make it Fun and they will stick with it. Make it a grind at a young age and they will learn to hate it.